// 0100 1000 0110 1001 0010 0001
const { Buffer } = require('buffer')

const buff = Buffer.alloc(3)

buff[0] = 0x48
buff[1] = 0x69
buff[2] = 0x21

console.log(buff)
console.log(buff.toString('hex'))
console.log(buff.toString('utf-8'))